X-linked ichthyosis

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X-linked ichthyosis
Other namesSteroid sulfatase deficiency, X-linked recessive ichthyosis [1]
X-linked recessive.svg
X-linked recessive inheritance: Affected boys may inherit a deletion or mutation of the STS gene from their mothers
Specialty Medical genetics   OOjs UI icon edit-ltr-progressive.svg

X-linked ichthyosis (abbreviated XLI) is a skin condition caused by the hereditary deficiency of the steroid sulfatase (STS) enzyme that affects 1 in 2000 to 1 in 6000 males. [2] XLI manifests with dry, scaly skin [3] and is due to deletions [4] [5] or mutations [6] in the STS gene. XLI can also occur in the context of larger deletions causing contiguous gene syndromes. [4] Treatment is largely aimed at alleviating the skin symptoms. [7] The term is from the Ancient Greek 'ichthys' meaning 'fish'.

Contents

Signs and symptoms

X linked ichthyosis Boy with X linked Ichthyosis rotated.JPG
X linked ichthyosis

The major symptoms of XLI include scaling of the skin, particularly on the neck, trunk, and lower extremities. The extensor surfaces are typically the most severely affected areas. The >4 mm diameter scales adhere to the underlying skin and can be dark brown or gray in color. Symptoms may subside during the summer. [2]

Associated medical conditions

Aside from the skin scaling, XLI is not typically associated with other major medical problems. [8] Atrial fibrillation or atrial flutter may affect up to 1 in 10 males with XLI. [9] Heart rhythm abnormalities in individuals with XLI tend to co-occur with disorders of the gastrointestinal tract, and are likely to result from steroid sulfatase deficiency. [10] Cardiac arrhythmia in XLI may be related to abnormal development of the interventricular septum or interatrial septum. [11] Corneal opacities may be present but do not affect vision. Cryptorchidism is reported in some individuals. [2] Individuals with XLI appear at increased risk of developmental disorders such as autism and Attention Deficit Hyperactivity Disorder and some affected individuals exhibit mood problems [12] Mood problems in XLI appear to be most influenced by stigma or bullying associated with the skin condition, and by difficulties with treating the skin condition. [13] XLI is associated with mild-moderate impairments in memory which appear to be independent of effects on mood. [14] Blood-clotting abnormalities may occur more frequently in males with XLI and female carriers. [15] Individuals with XLI can exhibit intellectual disability, although this is thought to be due to deletions encompassing neighboring genes (e.g. VCX) in addition to STS. [16] The skin and medical conditions associated with XLI are likely to be due to perturbed basement membrane function and abnormal interactions with the extracellular matrix. [17] Knockdown of STS gene expression in human skin cell cultures affects pathways associated with skin function, brain and heart development, and blood-clotting that may be relevant for explaining the skin condition and increased likelihood of ADHD/autism, cardiac arrhythmias and disorders of hemostasis in XLI [18]

Female carriers generally do not experience any of these problems but can have difficulty during childbirth, as the STS expressed in the placenta plays a role in normal labor. [19] Female carriers may also be at slightly increased risk of developing mental health problems following childbirth [20] For these reasons carriers should ensure their obstetrician is aware of the condition.[ citation needed ]

Genetics

X linked ichthyosis - this boy has an infant brother and maternal uncle with the same condition IchthyosisXlinked2.JPG
X linked ichthyosis - this boy has an infant brother and maternal uncle with the same condition

The STS gene is located on the X chromosome at band Xp22.3. Thus, the syndrome is an X-linked condition, and it affects males and females differently. The 23rd pair of chromosomes is typically termed the "sex chromosomes". Females have two X chromosomes and males have one X and one Y chromosome. Therefore, in normal individuals, males carry a single copy of the STS gene and females carry two copies. This gene partially escapes X-inactivation and females normally express higher amounts of the STS enzyme than males. [21]

XLI can occur through new deletions or mutations of the STS gene but is more commonly inherited from a carrier mother. [22] A hemizygous deletion or mutation of the STS gene in a male results in complete absence of enzyme activity, while a female carrier of a mutation or deletion is heterozygous and still has a normal copy of the STS gene. Female carriers of an STS deletion or mutation still express the STS enzyme, although with decreased enzyme activity. [23]

For this reason, XLI most commonly affects males, although individuals with numeric abnormalities of the sex chromosomes (45,X and 47,XXY) who also carry STS deletions or mutations would be exceptions to this rule.[ citation needed ]

In addition, a female could be affected if she were the offspring of an affected male and a carrier female and inherited a deletion or mutation of the STS gene on both X chromosomes.

Genetic counseling issues

Since the majority of cases appear to occur through transmission of an STS deletion from a carrier mother, [22] enzyme testing or DNA testing should be performed in the mother of any newly diagnosed simplex case (i.e. the first case in a family). In the case of an extended family with many affected individuals, carrier status can often be assigned based on pedigree analysis.

Due to random segregation of the chromosomes during gametogenesis, each pregnancy will be subject to the same probabilities, regardless of the number of previously affected or unaffected offspring. The above recurrence risks are based on the assumption that an affected male or carrier female will have children with an unaffected or non-carrier individual. The risks of having affected offspring would clearly increase in the case of a union between a male with XLI and a carrier female.

Physiology/biochemistry

DHEA sulfate DHEA sulfate.png
DHEA sulfate

The STS enzyme (EC 3.1.6.2), also referred to as Arylsulfatase C, is expressed throughout the body, with highest expression in the skin, liver, lymph nodes, and placenta, and lower expression in breast tissue and brain [24] STS catalyzes the hydrolysis of sulfated steroids, such as estrone sulfate and dehydroepiandrosterone sulfate (DHEAS), to non-sulfated steroids estradiol and androstenediol, respectively. [25] Prenatally, the enzyme is involved in placental estrogen production. [26] The enzyme is also involved in adrenal steroid production as well as conversion of sulfated steroids in other tissues.[ citation needed ]

There seems to be a particularly important role for the enzyme in skin. Deficiency of the enzyme leads to the characteristic dry and scaly skin seen in ichthyosis. Recent research indicates that the skin abnormalities seen in XLI may be due to accumulation of cholesterol sulfate in the outer epidermis, leading to abnormal barrier function and corneocyte retention. [27]

Diagnosis

XLI can be suspected based on clinical findings, although symptoms can take varying amounts of time to become evident, from a few hours after birth, up to a year in milder cases. The diagnosis is usually made by a dermatologist, who also typically formulates the treatment plan (see below). STS enzyme deficiency is confirmed using a clinically available biochemical assay. Carrier detection can be performed in mothers of affected sons using this test (see Genetics, below). [23] Molecular testing for DNA deletions or mutations is also offered, and can be particularly useful in the evaluation of individuals with associated medical conditions (see below). Prenatal diagnosis is possible using either biochemical or molecular tests. However, the use of prenatal diagnosis for genetic conditions that are considered to be generally benign raises serious ethical considerations and requires detailed genetic counseling.[ citation needed ]

Treatment

Because XLI is caused by a gene mutation or deletion, there is no "cure." One of the aims of treatment is to reduce scaling by removing the excess, flaky scales, and keep the skin hydrated. This can be achieved using a variety of topical creams. [2] [7] Other treatments involve

Research is ongoing with regard to the use of gene therapy to treat XLI. [30] Timber Pharmaceuticals is planning on conducting a phase 3 trial of its investigational topical isotretinoin product in the second quarter of 2022 for the treatment of congential ichthyosis. [31]

History

In the 1960s, recessive x-linked ichthyosis was distinguished clinically from other ichthyoses. [32] : 486  [33] : 561 

See also

Related Research Articles

<span class="mw-page-title-main">Genetic disorder</span> Health problem caused by one or more abnormalities in the genome

A genetic disorder is a health problem caused by one or more abnormalities in the genome. It can be caused by a mutation in a single gene (monogenic) or multiple genes (polygenic) or by a chromosomal abnormality. Although polygenic disorders are the most common, the term is mostly used when discussing disorders with a single genetic cause, either in a gene or chromosome. The mutation responsible can occur spontaneously before embryonic development, or it can be inherited from two parents who are carriers of a faulty gene or from a parent with the disorder. When the genetic disorder is inherited from one or both parents, it is also classified as a hereditary disease. Some disorders are caused by a mutation on the X chromosome and have X-linked inheritance. Very few disorders are inherited on the Y chromosome or mitochondrial DNA.

<span class="mw-page-title-main">5α-Reductase 2 deficiency</span> Medical condition

5α-Reductase 2 deficiency (5αR2D) is an autosomal recessive condition caused by a mutation in SRD5A2, a gene encoding the enzyme 5α-reductase type 2 (5αR2). The condition is rare, affects only genetic males, and has a broad spectrum.

<span class="mw-page-title-main">Lesch–Nyhan syndrome</span> Rare genetic disorder

Lesch–Nyhan syndrome (LNS) is a rare inherited disorder caused by a deficiency of the enzyme hypoxanthine-guanine phosphoribosyltransferase (HGPRT). This deficiency occurs due to mutations in the HPRT1 gene located on the X chromosome. LNS affects about 1 in 380,000 live births. The disorder was first recognized and clinically characterized by American medical student Michael Lesch and his mentor, pediatrician William Nyhan, at Johns Hopkins.

<span class="mw-page-title-main">Menkes disease</span> X-linked recessive copper-transport disorder

Menkes disease (MNK), also known as Menkes syndrome, is an X-linked recessive disorder caused by mutations in genes coding for the copper-transport protein ATP7A, leading to copper deficiency. Characteristic findings include kinky hair, growth failure, and nervous system deterioration. Like all X-linked recessive conditions, Menkes disease is more common in males than in females. The disorder was first described by John Hans Menkes in 1962.

<span class="mw-page-title-main">X-linked recessive inheritance</span> Mode of inheritance

X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be always expressed in males and in females who are homozygous for the gene mutation, see zygosity. Females with one copy of the mutated gene are carriers.

<span class="mw-page-title-main">Sex linkage</span> Sex-specific patterns of inheritance

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<span class="mw-page-title-main">Leukodystrophy</span> Group of disorders characterised by degeneration of white matter in the brain

Leukodystrophies are a group of, usually, inherited disorders, characterized by degeneration of the white matter in the brain. The word leukodystrophy comes from the Greek roots leuko, "white", dys, "abnormal" and troph, "growth". The leukodystrophies are caused by imperfect growth or development of the glial cells which produce the myelin sheath, the fatty insulating covering around nerve fibers. Leukodystrophies may be classified as hypomyelinating or demyelinating diseases, respectively, depending on whether the damage is present before birth or occurs after. While all leukodystrophies are the result of genetic mutations, other demyelinating disorders have an autoimmune, infectious, or metabolic etiology.

<span class="mw-page-title-main">X-linked agammaglobulinemia</span> Medical condition

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<span class="mw-page-title-main">Corneal dystrophy</span> Medical condition

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<span class="mw-page-title-main">Sex chromosome</span> Chromosome that differs from an ordinary autosome in form, size, and behavior

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<span class="mw-page-title-main">Netherton syndrome</span> Medical condition

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References

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  2. 1 2 3 4 Carlo Gelmetti; Caputo, Ruggero (2002). Pediatric Dermatology and Dermatopathology: A Concise Atlas. T&F STM. p. 160. ISBN   978-1-84184-120-5.
  3. ↑ Online Mendelian Inheritance in Man (OMIM): ICHTHYOSIS, X-LINKED - 308100
  4. 1 2 Ballabio A, Parenti G, Carrozzo R, et al. (1987). "Isolation and characterization of a steroid sulfatase cDNA clone: genomic deletions in patients with X-chromosome-linked ichthyosis". Proc. Natl. Acad. Sci. U.S.A. 84 (13): 4519–23. Bibcode:1987PNAS...84.4519B. doi: 10.1073/pnas.84.13.4519 . PMC   305121 . PMID   3474618.
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  7. 1 2 Ichthyosis, X-Linked at eMedicine: Treatment Section
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  12. ↑ Chatterjee S, Humby T, Davies W (2016) Behavioural and psychiatric phenotypes in men and boys with X-linked ichthyosis: evidence from a worldwide online survey. PLoS One 11(10):e0164417 PMID 27711218 doi:10.1371/journal.pone.0164417 URL: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0164417
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  14. ↑ Wren G, Flanagan J, Underwood J, Thompson A, Humby T, Davies W (2024) Memory, mood and associated neuroanatomy in individuals with steroid sulphatase deficiency (X-linked ichthyosis). Genes Brain and Behavior doi:10.1111/gbb.12893 URL:https://onlinelibrary.wiley.com/doi/10.1111/gbb.12893
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  17. ↑ Wren GH, Davies W (2022) X-linked ichthyosis: New insights into a multi-system disorder Skin Health and Disease PMID 36479267 doi:10.1002/ski2.179 URL:https://onlinelibrary.wiley.com/doi/10.1002/ski2.179
  18. ↑ McGeoghan F, Camera E, Maiellaro M, Menon M, Huang M, Dewan P, Ziaj S, Caley MP, Donaldson M, Enright AJ, O'Toole EA (2023) RNA sequencing and lipidomics uncovers novel pathomechanisms in recessive X-linked ichthyosis Frontiers in Molecular Biosciences 10:1176802 PMID 37363400 doi:10.3389/fmolb.2023.1176802 URL:https://www.frontiersin.org/articles/10.3389/fmolb.2023.1176802/full
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  22. 1 2 Valdes-Flores M, Kofman-Alfaro SH, Jimenez-Vaca AL, Cuevas-Covarrubias SA (August 2001). "Carrier identification by FISH analysis in isolated cases of X-linked ichthyosis". Am. J. Med. Genet. 102 (2): 146–8. doi:10.1002/ajmg.1450. PMID   11477606.
  23. 1 2 Cuevas-Covarrubias SA, Kofman-Alfaro S, Orozco Orozco E, Diaz-Zagoya JC (1995). "The biochemical identification of carrier state in mothers of sporadic cases of X-linked recessive ichthyosis". Genet. Couns. 6 (2): 103–7. PMID   7546451.
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  29. ↑ Cotellessa C, Cuevas-Covarrubias SA, Valeri P, Fargnoli MC, Peris K (2005). "Topical tazarotene 0.05% versus glycolic acid 70% treatment in X-linked ichthyosis due to extensive deletion of the STS gene". Acta Derm. Venereol. 85 (4): 346–8. doi: 10.1080/00015550510026613 . PMID   16191859.
  30. ↑ Freiberg RA, Choate KA, Deng H, Alperin ES, Shapiro LJ, Khavari PA (1997). "A model of corrective gene transfer in X-linked ichthyosis". Hum. Mol. Genet. 6 (6): 927–33. doi: 10.1093/hmg/6.6.927 . PMID   9175741.
  31. ↑ "Press Releases". Timber. Retrieved 2022-04-03.
  32. ↑ Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN   0-07-138076-0.
  33. ↑ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN   0-7216-2921-0.
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